chore: move the go code into a subfolder

apps/api/cmd/setup/15/06_cs_from_projections.sql

@@ -0,0 +1,28 @@
+INSERT INTO projections.current_states (
+    projection_name
+    , instance_id
+    , event_date
+    , "position"
+    , last_updated
+) SELECT 
+    cs.projection_name
+    , cs.instance_id
+    , e.created_at
+    , e.position
+    , cs.timestamp
+FROM 
+    projections.current_sequences cs
+JOIN eventstore.events2 e ON
+    e.instance_id = cs.instance_id 
+    AND e.aggregate_type = cs.aggregate_type
+    AND e.sequence = cs.current_sequence 
+    AND cs.current_sequence = (
+        SELECT 
+            MAX(cs2.current_sequence)
+        FROM
+            projections.current_sequences cs2
+        WHERE
+            cs.projection_name = cs2.projection_name
+            AND cs.instance_id = cs2.instance_id
+    )
+ON CONFLICT DO NOTHING;